Round off to the nearest 10:
a) 22 -> 20
b) 35 -> 40
c) 48 -> 50
d) 65 -> 70
e) 72 -> 70
f) 83 -> 80
g) 191 -> 190
h) 348 -> 350
i) 4508 -> 4510
j) 612 -> 610
k) 5421 -> 5420
Answer (1)
Rounding numbers is a basic mathematical technique used to make numbers simpler and easier to work with, while still keeping them close to their original value. When rounding to the nearest ten, you look at the ones digit of the number to determine which ten it is closer to.
Here's a step-by-step explanation for rounding each of the numbers provided:
22:
Look at the ones digit: 2
If the ones digit is less than 5, round down to the nearest ten.
Therefore, 22 rounds down to 20.
35:
Look at the ones digit: 5
If the ones digit is 5 or more, round up to the nearest ten.
Therefore, 35 rounds up to 40.
48:
Look at the ones digit: 8
Since 8 is greater than 5, round up to the nearest ten.
Therefore, 48 rounds up to 50.
65:
Look at the ones digit: 5
Since it is 5, round up to the next ten.
Therefore, 65 rounds up to 70.
72:
Look at the ones digit: 2
Since 2 is less than 5, round down.
Therefore, 72 rounds down to 70.
83:
Look at the ones digit: 3
Since 3 is less than 5, round down.
Therefore, 83 rounds down to 80.
191:
Look at the ones digit: 1
Since 1 is less than 5, round down.
Therefore, 191 rounds down to 190.
348:
Look at the ones digit: 8
Since 8 is more than 5, round up.
Therefore, 348 rounds up to 350.
4508:
Look at the ones digit: 8
Since 8 is more than 5, round up.
Therefore, 4508 rounds up to 4510.
612:
* Look at the ones digit: 2
* Since 2 is less than 5, round down.
* Therefore, 612 rounds down to 610.
5421:
* Look at the ones digit: 1
* Since 1 is less than 5, round down.
* Therefore, 5421 rounds down to 5420.
Rounding is particularly useful in everyday situations such as making quick calculations or estimating costs, where precision is not crucial.
